Improving the lateral stability of high speed trains using elastic-suspended motors based on inerter structure
Yayun Qi, Ao Peng, Huanyun Dai, Hua Liu, Hao Wu, Xing He, Rui Zou
Abstract
As a novel structural control element, the damper container has been extensively used in structural vibration systems. However, its application in the elastic-suspended motor of high-speed trains remains underexplored. This paper presents an inerter-spring-damper model of the motor suspension for high-speed trains, analyzing the frequency-varying characteristics of the inerter-spring-damper structure and its effect on the stability of the bogie. A global sensitivity analysis of the main suspension parameters and optimisation of these parameters is conducted. Finally, a comparative study of the dynamic responses of the two structures is performed. The results show that the inerter-spring-damper structure enhances the adaptability of the suspension due to its frequency-varying characteristics. Adding an inerter further reduces the bogie’s hunting frequency and amplitude, suppressing motor vibration, and enhancing overall vehicle stability. Under normal and worn wheel-rail contact conditions, the carbody acceleration, bogie acceleration, motor acceleration, and wheel-rail lateral force of the inerter-spring-damper suspension structure are all lower than those of the spring-damper suspension structure. At a speed of 350 km/h, the root mean square values can be reduced by 0.034, 2.718, 2.575 m/s2, and 3.833 kN, respectively. These findings provide a valuable reference for the design of elastic suspensions of bogie motors.